California Code, Health and Safety Code - HSC § 44299.85

(a) A district may include any reduction in PM emissions that result from the implementation of the program in any state implementation plan, or revision of that plan, that is submitted to the state board pursuant to Chapter 10 (commencing with Section 40910) of Part 3 for a particulate matter nonattainment area.

(b) All emission reductions or reduction credits resulting from a project funded by a district pursuant to this chapter are the property of the district that approved the grant. The district may utilize those emission reductions or reduction credits first to fulfill local and regional commitments to air quality standards. Any additional reductions or credits that exist after the local or regional commitment to air quality is fulfilled may be used by the state board to fulfill the state's commitment to air quality standards and attainment.